1. Performance Specifications
A description of how well an artifact performs

2. Prescriptive Performance Specifications
Range of acceptable performance
Performance, not product or means of achieving that performance
Stated in way that is independent of a particular solution
Quantify, if possible
range
maximum or minimum

3. Examples Weight and length of ladder Loudness of radio
Frequency response of audio
Power radio consumes
Sensitivity to rf signals
How far digital indicators can be read

4. Interface Performance Specifications
How well devices or systems must work together with other systems
Physical fit with each other
Electrical impedance matching
Under the hood of an automobile

5. Detailed Design Performance Specifications
After the fact, how the device actually operates after it is created